首页
登录
职称英语
[originaltext] Why, you may wonder, should spiders be our friends? (26)Beca
[originaltext] Why, you may wonder, should spiders be our friends? (26)Beca
游客
2023-09-02
59
管理
问题
Why, you may wonder, should spiders be our friends? (26)Because they destroy so many insects, and insects include some of the greatest enemies of the human race. Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals. (27)We owe a lot to the birds and beasts which eat insects but all of them put together kill only a fraction of the number destroyed by spiders. Moreover, unlike some of the other insect eaters, (26)spiders never do the harm to us or our belongings.
Spiders are not insects, as many people think, nor even nearly related to them. One can tell the difference almost at a glance, (28)for a spider always has eight legs and insect never more than six.
How many spiders are engaged in this work in our behalf? One authority on spiders made a census of the spiders in grass field in the south of England, and he estimated that there were more than 2 250 000 in one acre; that is something like 6 000 000 spiders of different kinds on a football pitcll. (29)Spiders are busy for at least half the year in killing insects. It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, not content with only three meals a day. It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
选项
A、All the time.
B、For most of the year.
C、In the summer months.
D、For a minimum of six months of each year.
答案
D
解析
事实细节题 。蜘蛛至少有半年的时间忙于消灭害虫,即D “每年至少有六个月的时间”。minimum意为“最小值,最少”。
转载请注明原文地址:https://tihaiku.com/zcyy/2979507.html
相关试题推荐
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
[originaltext]I’dliketosharewithyoutodaymyexperiencewithanewap
[originaltext]I’dliketosharewithyoutodaymyexperiencewithanewap
Haditnotbeenforthetrafficjam,___________________(我已经走完50英里了).Ishouldh
[originaltext]WhenMidoriwastwoyearold,sheoftenclimbedontothepiano
[originaltext]Recently.amanwhowasalwaysi13goodhealth,spentaweek
[originaltext]Climateresearchersstilldonotagreeonwhethertheearth
[originaltext]Climateresearchersstilldonotagreeonwhethertheearth
随机试题
Mostpeoplethinkofsharksashuge,powerful,frighteningpredators,ready
端口是网络层和运输层之间的接口。()
防止雷直击于发变电站,只可以装设避雷针来保护。
理想变压器属于线性非互易的多端元件()
脓肿切开引流术的基本原则是什么?
基金业协会会员的类型不包括( )。A.普通会员 B.联席会员 C.观察会员
胰高血糖素对代谢的作用正常的是A:促进糖原分解和糖异生B:促进糖原分解,抑制糖
A.1/2 B.2/3 C.2/5 D.3/5
A. B. C. D.
去年建成今年销售的房地产和今年建成已销售的房地产均计入今年的GDP。( )
最新回复
(
0
)